# 1990 Rosmalen Grass Court Championships – Singles

In the inaugural edition of the tournament, Amos Mansdorf won the title after defeating Alexander Volkov 6–3, 7–6 in the final.

## Seeds

* Yannick Noah (first round)
* Karel Nováček (first round)
* Jakob Hlasek (second round)
* Paul Haarhuis (first round)
* Richey Reneberg (semifinals)
* Jim Grabb (second round)
* (n/a)
* Dan Goldie (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final |
| | Amos Mansdorf | 6 | 6 | | | | |
| 5 | Richey Reneberg | 4 | 4 | | | | |
| 5 | Richey Reneberg | 4 | 4 | | Amos Mansdorf | 6 | 7 |
| | | | | | Alexander Volkov | 3 | 6 |
| | Alexander Volkov | 6 | 4 | 6 | Alexander Volkov | 3 | 6 |
| Q | Patrick McEnroe | 3 | 6 | 3 | | | |

### Top half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | Y Noah | 3 | 3 | | | | | | | | | | | | | |
| | M Šrejber | 6 | 6 | | M Šrejber | 4 | 4 | | | | | | | | | |
| | M Schapers | 4 | 5 | Q | H Holm | 6 | 6 | | | | | | | | | |
| Q | H Holm | 6 | 7 | | | | | | Q | H Holm | 3 | 4 | | | | |
| | K Evernden | 4 | 3 | | | | | | | A Mansdorf | 6 | 6 | | | | |
| | A Mansdorf | 6 | 6 | | A Mansdorf | 7 | 1 | 7 | | | | | | | | |
| | T Nijssen | 5 | 1 | 8 | D Goldie | 6 | 6 | 6 | | | | | | | | |
| 8 | D Goldie | 7 | 6 | | | | | | | | | | | A Mansdorf | 6 | 6 |
| 4 | P Haarhuis | 6 | 6 | | | | | | | | | | 5 | R Reneberg | 4 | 4 |
| | D Engel | 7 | 7 | | D Engel | 6 | 6 | | | | | | | | | |
| | M Nido | 4 | 2 | | J Tarango | 1 | 2 | | | | | | | | | |
| | J Tarango | 6 | 6 | | | | | | | D Engel | 6 | 4 | | | | |
| | M Mečíř | 3 | 2 | | | | | | 5 | R Reneberg | 7 | 6 | | | | |
| | M Stich | 6 | 6 | | M Stich | 7 | 3 | 3 | | | | | | | | |
| | M Woodforde | 2 | 4 | 5 | R Reneberg | 5 | 6 | 6 | | | | | | | | |
| 5 | R Reneberg | 6 | 6 | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | J Grabb | 7 | 4 | 6 | | | | | | | | | | | | | | |
| Q | J Eltingh | 6 | 6 | 4 | 6 | J Grabb | 3 | 6 | 6 | | | | | | | | | |
| | A Volkov | 6 | 6 | | | A Volkov | 6 | 4 | 7 | | | | | | | | | |
| | O Delaître | 2 | 1 | | | | | | | | A Volkov | 6 | 6 | | | | | |
| | C Saceanu | 4 | 4 | | | | | | | | G Layendecker | 3 | 4 | | | | | |
| | G Layendecker | 6 | 6 | | | G Layendecker | 7 | 7 | | | | | | | | | | |
| LL | N Odizor | 4 | 7 | 2 | 3 | J Hlasek | 5 | 5 | | | | | | | | | | |
| 3 | J Hlasek | 6 | 6 | 6 | | | | | | | | | | | A Volkov | 6 | 4 | 6 |
| Q | P McEnroe | 6 | 6 | | | | | | | | | | | Q | P McEnroe | 3 | 6 | 3 |
| WC | T Kempers | 0 | 3 | | Q | P McEnroe | 6 | 6 | | | | | | | | | | |
| WC | J Siemerink | 6 | 6 | | WC | J Siemerink | 2 | 3 | | | | | | | | | | |
| | L Jönsson | 1 | 4 | | | | | | | Q | P McEnroe | 6 | 6 | | | | | |
| | T Högstedt | 6 | 6 | | | | | | | | R Weiss | 3 | 4 | | | | | |
| Q | B Garnett | 7 | 7 | | Q | B Garnett | 6 | 4 | | | | | | | | | | |
| | R Weiss | 6 | 7 | | | R Weiss | 7 | 6 | | | | | | | | | | |
| 2 | K Nováček | 3 | 6 | | | | | | | | | | | | | | | |